x^2+.18x-.036=0

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Solution for x^2+.18x-.036=0 equation:


Simplifying
x2 + 0.18x + -0.036 = 0

Reorder the terms:
-0.036 + 0.18x + x2 = 0

Solving
-0.036 + 0.18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.036' to each side of the equation.
-0.036 + 0.18x + 0.036 + x2 = 0 + 0.036

Reorder the terms:
-0.036 + 0.036 + 0.18x + x2 = 0 + 0.036

Combine like terms: -0.036 + 0.036 = 0.000
0.000 + 0.18x + x2 = 0 + 0.036
0.18x + x2 = 0 + 0.036

Combine like terms: 0 + 0.036 = 0.036
0.18x + x2 = 0.036

The x term is 0.18x.  Take half its coefficient (0.09).
Square it (0.0081) and add it to both sides.

Add '0.0081' to each side of the equation.
0.18x + 0.0081 + x2 = 0.036 + 0.0081

Reorder the terms:
0.0081 + 0.18x + x2 = 0.036 + 0.0081

Combine like terms: 0.036 + 0.0081 = 0.0441
0.0081 + 0.18x + x2 = 0.0441

Factor a perfect square on the left side:
(x + 0.09)(x + 0.09) = 0.0441

Calculate the square root of the right side: 0.21

Break this problem into two subproblems by setting 
(x + 0.09) equal to 0.21 and -0.21.

Subproblem 1

x + 0.09 = 0.21 Simplifying x + 0.09 = 0.21 Reorder the terms: 0.09 + x = 0.21 Solving 0.09 + x = 0.21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.09' to each side of the equation. 0.09 + -0.09 + x = 0.21 + -0.09 Combine like terms: 0.09 + -0.09 = 0.00 0.00 + x = 0.21 + -0.09 x = 0.21 + -0.09 Combine like terms: 0.21 + -0.09 = 0.12 x = 0.12 Simplifying x = 0.12

Subproblem 2

x + 0.09 = -0.21 Simplifying x + 0.09 = -0.21 Reorder the terms: 0.09 + x = -0.21 Solving 0.09 + x = -0.21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.09' to each side of the equation. 0.09 + -0.09 + x = -0.21 + -0.09 Combine like terms: 0.09 + -0.09 = 0.00 0.00 + x = -0.21 + -0.09 x = -0.21 + -0.09 Combine like terms: -0.21 + -0.09 = -0.3 x = -0.3 Simplifying x = -0.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.12, -0.3}

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